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From The Aquarium Wiki

Opistognathidae, or Jawfish, are marine fish belonging to the order Perciformes. There are 3 genera and 60 species in this family.

	Common name	Difficulty	Maximum Size	Minimum Tank Size
Opistognathus aurifrons	Yellowhead Jawfish Yellowhead Caribbean Jawfish Pearly Jawfish Yellowhead Goby	Moderate	44 in10.16 cm	2020 gal75.708 liters 75,708.236 mL